NAME

       avifdec - decompress an AVIF file to an image file

SYNOPSIS

       avifdec [options] input.avif output.[jpg|jpeg|png|y4m]

       avifdec --info input.avif

DESCRIPTION

       avifdec  decompresses  an AVIF file to an image file.  Output format can be either JPEG, PNG or YUV4MPEG2
       (Y4M).

OPTIONS

       -h, --help
              Show syntax help.

       -V, --version
              Show the version number.

       -j, --jobs J
              Number of jobs (worker threads), or `all' to potentially use as many cores as possible.  (Default:
              all).

       -c, --codec C
              Codec to use.

              Possible values depend on the codecs enabled at build  time  (see  --help  or  --version  for  the
              available codecs).  Default is auto-selected from the available codecs.

              Possible values are:

              • aom

              • dav1d

              • libgav1

       -d, --depth D
              Output depth, either 8 or 16.  (PNG only; For y4m, depth is retained, and JPEG is always 8bpc).

       -q, --quality Q
              Output quality in 0..100.  (JPEG only, default: 90).

       --png-compress L
              PNG compression level in 0..9 (PNG only; 0=none, 9=max).  Defaults to libpng’s builtin default.

       -u, --upsampling U
              Chroma  upsampling  (for 420/422).  One of `automatic' (default), `fastest', `best', `nearest', or
              `bilinear'.

       -r, --raw-color
              Output raw RGB values instead of multiplying by alpha when saving to opaque  formats  (JPEG  only;
              not applicable to y4m).

       --index I
              When  decoding  an image sequence or progressive image, specify which frame index to decode, where
              the first frame has index 0, or `all' to decode all frames.  (Default: 0)

       --progressive
              Enable progressive AVIF processing.  If a progressive image is encountered  and  --progressive  is
              passed, avifdec will use --index to choose which layer to decode (in progressive order).

       --no-strict
              Disable strict decoding, which disables strict validation checks and errors.

       -i, --info
              Decode all frames and display all image information instead of saving to disk.

       --icc FILENAME
              Provide an ICC profile payload (implies --ignore-icc).

       --ignore-icc
              If the input file contains an embedded ICC profile, ignore it (no-op if absent).

       --size-limit C
              Maximum image size (in total pixels) that should be tolerated.  (Default: 268435456).

       --dimension-limit C
              Maximum  image  dimension  (width  or  height)  that  should  be  tolerated.   Set to 0 to ignore.
              (Default: 32768).

       --     Signal the end of options.  Everything after this is interpreted as file names.

EXAMPLES

       Decompress an AVIF file to a PNG file:
              $ avifdec input.avif output.png

REPORTING BUGS

       Bugs can be reported on GitHub at:
              https://github.com/AOMediaCodec/libavif/issues

SEE ALSO

       avifenc(1)

libavif 1.2.1                                      2022-04-30                                         AVIFDEC(1)